Fix Telephony build

Change-Id: Ida0043d2e5ce4082663b321a2e260d05105af61c
diff --git a/src/com/android/phone/settings/PhoneAccountSettingsFragment.java b/src/com/android/phone/settings/PhoneAccountSettingsFragment.java
index 593d897..0085181 100644
--- a/src/com/android/phone/settings/PhoneAccountSettingsFragment.java
+++ b/src/com/android/phone/settings/PhoneAccountSettingsFragment.java
@@ -324,7 +324,7 @@
      */
     private void updateConfigureCallAssistant() {
         Intent intent = getConfigureCallAssistantIntent();
-        boolean shouldShow = intent != null && !mApplicationContext.getPackageManager()
+        boolean shouldShow = intent != null && !getActivity().getPackageManager()
             .queryIntentActivities(intent, 0).isEmpty();
 
         PreferenceCategory callAssistantCategory = (PreferenceCategory)